Contingencies - Aggregate Amount of Guarantee Payments, Discharge Payments and Payments on Behalf of Borrowers (Parenthetical) (Detail) (PEAKS Program [Member], USD $) In Thousands, unless otherwise specified	1 Months Ended	6 Months Ended
	Feb. 28, 2013	Jun. 30, 2013
PEAKS Program [Member]
Schedule of Claims and Contingencies [Line Items]
Guarantee payments paid to prior consolidation	$ 854	$ 854
Payments on behalf of borrowers prior to consolidation	$ 532	$ 532